[Python-Dev] Is implicit underscore assignment buggy? (original) (raw)
Terry Reedy tjreedy at udel.edu
Thu Jun 8 04:31:09 CEST 2006
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"Guido van Rossum" <guido at python.org> wrote in message news:ca471dc20606071625y55199a73r6ae369d5c8de4f52 at mail.gmail.com...
This is by design.
The intent is that as long as you call something that returns no value, your last result is not thrown away. IOW is the last result that wasn't None. Please don't change this.
What might be improved is the documentation of this, which I could not find in a few minutes of searching. As of current 2.4 docs, the Tutorial, Language, and Library manuals all have index pages for identifiers beginning with '' but none contain '' itself. (And none have entries for 'underscore'.)
Language Reference 2.3.2 Reserved classes of identifiers lists all the other special identifier classes starting with '' but not '' itself. I think this would be a good place for an entry for '_' and its special meaning in interactive mode.
Tutorial 2.1.2 Interactive Mode would be another place to mention the special use of '_'.
If there is something I missed (that is not indexed), then I missed it.
Terry Jan Reedy
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